Jincheng Huang

Experimental investigation of applying miller cycle to reduce NOx emission from diesel engine

Abstract An experimental investigation of nitrogen oxides (NOx) emission reduction from a diesel engine using the Miller cycle was carried out. A Lister-Petter diesel engine, type TS2, was used for the experiments. Three versions of Miller cycles were designed and realized on a diesel engine. A series of tests were carried out on the test rig to compare the performances and emissions of the original engine (standard dual cycle) with those of the three versions of Miller cycles. The test results from the standard dual cycle and from the three versions of Miller cycles showed that applying Miller cycle to the diesel engine could reduce the NOx emission from the diesel engine. The reduction ratios of NOx for the Miller cycles are from 4.4 to 17.5 per cent. The best reduction effect is Miller cycle 1 and the reduction rates of NOx are from 11.0 to 17.5 per cent.

Characteristics of a diffusion absorption refrigerator driven by the waste heat from engine exhaust

Abstract The characteristics of a diffusion absorption refrigerator driven by the waste heat from a diesel engine exhaust were investigated. The heating unit of the diffusion absorption refrigerator was modified to be able to utilize the waste heat from engine exhaust. A series of tests were conducted including the original refrigerator driven by the alternating current (AC) power, direct current (DC) power, liquid petroleum gas (LPG), and the waste heat from a diesel engine exhaust gas. The performances of the modified refrigerator driven by the waste heat from engine exhaust were compared with that of original performances of the refrigerator driven by AC, DC, and LPG. The results showed that the performances of the refrigerator driven by engine exhaust were better than that of the original refrigerator driven by AC and DC power. The results showed that the exhaust heat from diesel engine is an applicable, attractive energy resource for diffusion absorption refrigerator.

Performance and Emission Characteristics of a Diesel Engine Using Vegetable Oil Blended Fuel

Experimental tests have been carried out to evaluate the performance and emissions characteristics of a diesel engine when fuelled by blends of 25% vegetable oil with 75% diesel fuel, 50% vegetable oil with 50% diesel fuel, 75% vegetable oil with 25% diesel fuel, and 100% vegetable oil, compared with the performance, emissions characteristics of 100% diesel fuel. The series of tests were conducted and repeated six times using each of the test fuels. 100% of ordinary diesel fuel was also used for comparison purposes. The engine worked at a fixed speed of 1500 r/min, but at different loads respectively, i.e. 0%, 25%, 50%, 75% and 100% of the engine load. The performance and the emission characteristics of exhaust gases of the engine were compared and analyzed. The experimental results showed that the carbon monoxide (CO) emission from the vegetable oil and vegetable oil/diesel fuel blends were nearly all higher than that from pure diesel fuel at the engine 0% load to 75% load. Only at the 100% engine load point, the CO emission of vegetable oil and vegetable oil/diesel fuel blends was lower than that of diesel fuel. The hydrocarbon (HC) emission of vegetable oil and vegetable/diesel fuel blends were lower than that of diesel fuel, except that 50% of vegetable oil and 50% diesel fuel blend was a little higher than that of diesel fuel. The oxides of nitrogen (NOx) emission of vegetable oil and vegetable oil/diesel fuel blends, at the range of tests, were lower than that of diesel fuel.Copyright